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0 °C

An ice-cold solution of 3,5-bis(trifluoromethyl)-1,2-phenylenediamine (880 mg, 3.6 mmol) and pyridine (104 mg, 1.3 mmol) in methylene chloride (20 mL) was treated with ethyl 3-chloro-3-oxopropionate (181 mg, 1.2 mmol). The mixture was stirred at 0° C. for 3 h, then allowed to warm to room temperature and stirred for four days. The solution was diluted to 100 mL with methylene chloride, washed with saturated NH4Cl (3×20 mL), water (20 mL), and brine (20 mL), then dried over sodium sulfate and concentrated in-vacuo. The residue was purified over silica gel, eluting with 20%-30%-40% EtOAc/heptane, to yield 330 mg of a white solid as product. 1H NMR (500 MHz, DMSO) δ ppm 1.22 (t, J=7.15 Hz, 3 H) 3.52 (s, 2 H) 4.14 (q, J=7.15 Hz, 2 H) 6.16 (s, 2 H) 7.54 (s, 1 H) 7.71 (m, 1 H) 9.60 (s, 1 H).

1. temperatureto warm to room temperature
2. stirringstirred for four days
3. washwashed with saturated NH4Cl (3×20 mL), water (20 mL), and brine (20 mL)
4. dry with materialdried over sodium sulfate
5. concentrationconcentrated in-vacuo
6. customThe residue was purified over silica gel
7. washeluting with 20%-30%-40% EtOAc/heptane